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My ecobee is making a "clicking" noise and will not turn on!

This article applies to the ecobee3, ecobee3 lite, and ecobee4

A clicking noise indicates that the voltage is insufficient between the RC and C terminals. This can sometimes be due to a bad C wire or a C wire that is not properly connected at the HVAC equipment side.

Consider the following:

If you repurposed a spare wire you found behind the wall to use as a C wire, please ensure that wire also connects to the C terminal or C connection point at your HVAC equipment

Try using another wire in place of the C wire, ensuring it is connected to C at both the ecobee and the HVAC equipment

If your C wire is bad and you are unable to repurpose another wire as C without sacrificing one of your HVAC system's functions, you may need to install the Power Extender Kit or run additional wires.